You are in the Content Browser, where you find all your Content items. The go-to-place for all users. Here you find the dedicated content channels and all content you need.
Picturepark Academy courses help understand basic Picturepark Content Platform functionality for end-users or light editors. The training videos are available via Pictureparks' YouTube channel: https://youtube.com/playlist?list=PL2mL63n_vtIeOJmeoeFSmDxmSBrrH6AXB
Picturepark executes all actions (from the toolbar or context menu) on the result set. Without any selection, the result set is all content.